Abstract Highly efficient diamond wire sawn (DWS) multi-crystalline Si (mc-Si) solar cells with a satisfactory visual appearance are expecting to dominate the photovoltaic industry soon. Here, we report the realization of broadband spectral response of DWS mc-Si solar cells with omnidirectional performance and improved appearance. The success lies in the effective surface texturization based on MACE technique followed by post acid modification and the introduction of SiO2/SiNx stack layers on the rear side. Bowl-like pits with an open size of about 1 µm are uniformly formed on the Si surface regardless of the crystallographic directions, which significantly enhances the antireflection ability in the short wavelength and makes the grain boundaries less noticeable. We have also shown that the bowl-like textured cells possess exceptional optical absorption over wide angles of incidence from 0° to 70°. Moreover, the SiO2/SiNx stack layers enhance the rear internal reflection and passivation, effectively increasing the long wavelength absorption and suppressing the electrical losses. We have successfully mass-produced DWS mc-Si solar cells with an average efficiency of 19.1%, which is 1.2% absolutely higher than that of the conventional micro-textured counterparts.

中文翻译：

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具有全向性能和改善外观的金刚石线锯多晶硅太阳能电池的宽带光谱响应

摘要 具有令人满意的视觉外观的高效金刚石线锯 (DWS) 多晶硅 (mc-Si) 太阳能电池有望很快主导光伏行业。在这里，我们报告了具有全向性能和改进外观的 DWS mc-Si 太阳能电池的宽带光谱响应的实现。成功在于基于 MACE 技术的有效表面纹理化，然后是后酸改性和在背面引入 SiO2/SiNx 堆叠层。无论结晶方向如何，在Si表面均均匀地形成开口尺寸约为1μm的碗状凹坑，这显着增强了短波长的抗反射能力并使晶界不那么明显。我们还表明，碗状纹理单元在 0° 到 70° 的宽入射角范围内具有出色的光吸收。此外，SiO2/SiNx 堆叠层增强了背面内反射和钝化，有效地增加了长波长吸收并抑制了电损耗。我们已成功量产 DWS mc-Si 太阳能电池，平均效率为 19.1%，绝对比传统微纹理同类产品高 1.2%。